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' (No Model.)

G. R. JARMA'N. PURNAGE FEEDING DEVIG'E.

No. 574331. V Patented Dec. 29, 1896.

UNITED STATES PATENT OFFICE.

GEORGE R. JARMAN, OF RICHMOND, VIRGINIA, ASSIGNOR TO GEORGE A. LATHROP,JR, OF SAME PLACE.

FURNACE-FEEDING DEVICE.

SPECIFICATION forming part of Letters Patent No. 574,331, dated December29, 1896.

Application filed April 2, 1896. Serial NO- 585,974. (No model.)

T0 to whom it may concern:

Be it known that I, GEORGE R. JARMAN, a

citizen of the United States, residing at Rich-' mond, in the county ofHenrico and State of Virginia, have invented certain new and usefulImprovements in Furnace-Feeding Devices, of whichthe following is aspecification, reference being had therein to the accompanying drawings.

This invention relates to improvements upon that class of injectordevices adapted to feed blasts of highly-heated commingled air and steamunder the grates of furnaces, to improve combustion, regulate the draft,irrespective of the length of the chimney, and keep the grate-bars cooland prevent the formation of clinkers.

The special objects of the present improvements, briefly, are to morethoroughly commingle the air and steam and to provide a nozzle whichshall be variable as to size and shape as well as in direction, wherebythe entire under grate-surface may be subjected to the blasts in thedesired quantities, irrespective of the size and shape of grate andash-pit and the character of coal used, as more fully hereinafter setforth.

In the drawings, Figure l is a vertical longitudinal section of thedevice mounted in the masonry wall of a furnace below the grate thereof;Fig. 2, a front view thereof; Fig. 3, a vertical cross-section, andFigs. 4, 5, and 6 detail end views showing some of the various shapesinto which the nozzle-plates are adapted to be bent.

Referring to the drawings by numerals, l is a horizontal cylindricalcasing set in the furnace and open at both ends, and set in the frontend of'this cylinder is a suitable vertical steam coil or spiral 2,which is perforated at intervals on its inner side, so as to directnumerous small jets of steam into the cylinder. Mounted in the cylinderbeyond the steam-coil is a small wind-wheel 3, adapted to freely revolvewhen subjected to a draft. WVithin the cylinder, near its inner end, area pair of thin metal nozzle-plates 4., these plates being attached attheir inner ends, respectively, to the upper and lower sides of thecylinder and their converging inner ends being free of the cylinder andterminating at or near the inner end thereof.

The operation of the device is obvious.

The numerous jets of steam passing through the cylinder create a suctionwhich draws in the air, and the two, partially commingled, strike thewind-wheel and cause the same to rapidly rotate. The rapid rotation ofthe wheel serves to break up the streams of steam and thoroughlycommingle the air and steam, so that the blast as it issues from thenozzle-plates will be perfectly homogeneous as well as highly heated,thereby greatly promoting combustion and keeping the grate cool.

An essential feature is the nozzle formed by the nozzle-plates, whichare made of thin malleable metal and are free at their innerconvergingends. .Theobjectinmakingthese plates of malleable metal andleaving their inner ends free is to permit the nozzle-opening to bevaried in shape to suit the exigencies of each case, as shown in thevarious views. The nozzle-plates may be readily bent and twisted bymeans of suitable tools. In this way the blasts from the several devicesused on each furnace may be directed to the desired portions of thegrate-surface in the desired quantities, irrespective of the shape andsize of the fire-box and the position of the injectors, whereby thewhole of the gratesurface may be subjected to the action of the blasts;and when only one of the devices is employed in a furnace the nozzle maybe shaped to best suit the style and size of grate and fire-box, thesteam-pressure at command, and the character of fuel used. This variablenozzle therefore facilitates the even and thorough consumption of thefuel, whatever kind be used, and is therefore a very important featureof my device.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is-

A furnace-feeding device consisting of an open-ended tube, a steam-jetat the front end of the tube, adapted to inject a jet of steam throughthe tube and draw air therethrough, and a pair of nozzle-plates inelosedwithin the tube at its inner end, these nozzle-plates being arranged oneabove the other and being secured to the tube at their forward ends andconverging toward their rear, free ends, said nozzle-plates beingmalleable to adapt them to be permanently flexed transversely andlongitudinally.

In testimony whereof I afiix my signature in presence of two witnesses.

GEO. R. JARMAN. Vitnesses:

C. D. DAVIS, ALEX. S. STEUART.

